Window lock



May 19, 1925.

F. A. WAHLIN WINDOW LOCK File Feb. 9, 1924 I iVEHID-FK Patented May 19, 1925.

FRANK A. WAHLIN, OF CHICAGO, ILLINOIS.

WINDOW LOCK.

Application filed February 9, 1924. Serial No. 691,612.

T 0 all whom it may concern:

Be it known that I, FRANK A. IVAI-ILIN, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a \Vindow Lock; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to a window lock adapted for locking the window against unauthorized movement from without, and comprises a member adapted to be applied or detached from the window as occasion requires, and is so constructed that it will provide a tight fit so that the same cannot be readily shaken loose.

The invention consists in the novel structure hereinafter described and more particularly pointed out and defined in the appended claim.

In the accompanying drawings which illustrate a. preferred embodiment of this invention and in which similar reference numerals refer to similar features in the different views:

Figure 1 is an enlarged fragmentary front elevational view of a window with the lock applied.

Figure 2 is also a fragmentary elevational view of a window illustrating the manner of attaching the lock.

Figure 3 is a sectional view through a window illustrating the lock in looking position and in side elevation.

Figure f is an enlarged elevational view of the lock.

Figure 5 is a sectional view upon the. line 5-5 of Figure 4.

As shown on the drawings:

Referring to the drawings, the numeral 1 represents the frame of the upper window section which has a sliding movement relative to the lower window section 2. The locking device involving this invention is adapted for locking the two window sections in closed position, or in partially opened position depending upon the location of the locking device. The locking device is represented as a whole by the. reference numeral 3. It is removably supported upon a headed stud l which is in. the nature of a screw. In the present instance the screw is located so that the locking device will lock the two window sections in closed position. It is however obvious that by changing the location of the screw by simply setting it higher, it will be possible to partially open one of the window sections. The extent to which the window sections may be opened may be limited. In hot weather when it is desired to maintain a window partially opened it becomes'possible to select the desired amount and lock the window section against further opening by an unauthorized person or robber.

The locking device 8 comprises a metal strip having an upper vertical portion 3 provided with a bayonet slot 3'9, ashort horizontal portion 3 and a downwardly sloping portion 3 which terminates substantially in the plane of the vertical portion 8. A triangular insert or filler 5 in the form of a plate is secured interiorly of the space defined by the horizontal portion 3 and the sloping portion 3. This insert prevents warping and distortion of the locking device, especially when in use.

In referring to Figure 1, it will be noted that the right hand edge. of the locking device is positioned closely adjacent the window frame 6 which acts as a support therefor. To allow this to be done, the upper end of the device is out upon the arc of a circle, the radius of whichis defined by the distance of the screw 4: from the right hand side of the window frame.

To attach the locking device upon the stud l, it is first positioned as shown in full lines in Figure 2 so that the stud may enter the bayonet slot. Then by rotating the device toward the left as shown in dotted line position, it may be brought into locking position as shown in Figures 1 and S. If the stud 4 is so located that the lower end of the locking device will abut the. lower window section when the sections are in closed position, the window will be locked in closed position. However, if the stud 4 is so located that the lower end of the locking device is above the lower window section when the window is closed, one of the window sections may be opened to this extent.

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, other wise than necessitated by the prior art.

I claim as my invention:

The combination with a window comprising a pair of relatively slidable sections and a frame therefor, of a stud upon one section spaced a distance from the side of said frame, and a locking device for said sections 19 having a bayonet slot for receiving said stud, and an arcuate upper end of a radius corresponding to the said distance of the said stud from the side of said frame.

In testimony whereof I have hereunto subscribed my name in the presence of two 15 subscribing witnesses.

FRANK A. VAHLIN. lVitnesses FRED E. PAEsLER, OSCAR I-IARTMANN. 

